Method for estimating storage capacity of small and medium-sized reservoirs in data-free area

Abstract

The invention discloses a method for estimating the storage capacity of small and medium-sized reservoirs in a data-free area. The method comprises the following steps of: calculating a flow directionand a confluence accumulation value of each grid above a reservoir outlet point by utilizing drainage basin DEM data; extracting riverway grids in the drainage basin; dividing the watershed river channel grids into reservoir area river channel grids and non-reservoir area river channel grids; extracting upstream grids corresponding to the non-reservoir area river channel grids; fitting elevation-distance curves of non-reservoir area river channel grids; weighting the elevation-distance curve of each non-reservoir area river channel grid, and solving the elevation-distance curves of the reservoir area river channel grids; based on the elevation-distance curves of the reservoir area river channel grids, obtaining elevation correction values of the reservoir area river channel grids; counting the non-reservoir area river channel grids, and solving elevation correction values of the non-reservoir area river channel grids; setting the reservoir surface water level, and calculating the reservoir storage capacity according to the reservoir area elevation correction values. The method has the advantages of being stable and reliable in data source, high in calculation efficiency, objectiveand reasonable in result and the like, and facilitates rapid estimation of small and medium-sized reservoir storage capacity in the data-free area.

Description

technical field [0001] The invention relates to the technical field of hydrology, in particular to a method for estimating storage capacity of small and medium-sized reservoirs in areas without data. Background technique [0002] There are many rivers in my country, with a drainage area of ​​200 to 3000 km 2 There are nearly 9,000 small and medium-sized rivers in China, and flood disasters occur frequently. Most of these small and medium watersheds are located in mountainous areas. The water and soil conditions along the coast of the watershed are good, there is a lot of cultivated land, and the population is dense. Once a flood occurs, it will seriously threaten the safety of people's lives and property. At present, the national small and medium-sized river hydrological monitoring system construction project is fully implemented, and some newly-built stations have been put into use. The hydrological conceptual model is the main method in the research of flood forecasting....

AI Technical Summary

Problems solved by technology

At present, large reservoirs can obtain water level and flow relationship curves, and flow data during reservoir scheduling; while small and medium-sized reservoirs and ponds and dams are large in number and widely distributed, and most of them were built in the 1950s and 1960s. Due to historical conditions, many of them are more complicated. The technical problems of the dam have not been completely resolved, and no technical information has been left when the dam was built, which increases the difficulty of flood forecasting and dispatching, and may even threaten the flood control safety of the reservoir and the river basin.

In recent years, with the development of information technologies such as computers, remote sensing and geographic information systems, people can easily obtain spatial information of watersheds, but the accuracy of topographic data of large water bodies such as reservoirs is not high.

Images